DESCRIPTION

The TK654xx low power step-down converter is designed for portable battery systems, capable of operating from a single Li-ion battery cell or multiple alkaline or rechargeable (NiCd or NiMH) battery cells (up to 6 V). The TK654xx provides the power switch, synchronous rectifier, and the control circuit for a buck step-down converter. Only two external components are required to complete the stepdown conversion.

FEATURES

■ Minimum External Component Count (1 coil, 1 cap)

■ Miniature 6 Pin SOT23L-6 Surface Mount Package

■ Up To 95 Efficient

■ Extremely Low Operating Current (24 µA)

■ Low Quiescent Current (18 µA)

■ Low Ripple

■ Fast Transient Response

■ Linear Dropout Characteristics

■ Short Circuit Protection

■ Regulates Down to 1.8 V

■ Synchronous Rectification

■ Internal Battery Monitor

APPLICATIONS

■ Battery Powered Systems

■ Cellular Telephones

■ Pagers

■ Personal Communications Equipment

■ Radio Controlled Systems

■ Toys